JP6714240B2 - Braking device for automatic winding screen device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a braking device used for an automatic winding screen that automatically winds a screen with a coil spring built in a winding shaft, and more particularly, to an automatic winding device that can maintain a good braking force regardless of temperature fluctuations. Type braking device for a screen.

2. Description of the Related Art Conventionally, there is known an automatic winding type screen device which is openably and closably attached to an opening or an opening of a building for insect prevention, dust prevention, light shielding, and the like. Patent Document 1 discloses an automatic wind-up type screen device that winds a screen by a rotational biasing force due to a twist of a coil spring built in a take-up shaft and suppresses an excessive increase in a take-up speed of the screen by an oil damper. It is disclosed.

JP, 2004-346707, A

However, in the automatic winding screen device described in Patent Document 1, the oil damper has a high temperature dependency, and when the oil used for the oil damper expands or contracts due to a temperature change, the braking force of the oil damper fluctuates. If the braking force is excessive, it is difficult to wind up the entire screen, and if the braking force of the oil damper is too low, there is a possibility that the impact at the time of winding the screen may not be alleviated. ..

Further, the oil damper repeatedly expands or contracts according to the temperature change, so that the oil leaks to the outside of the damper and the oil damper cannot exhibit a predetermined performance for a long time.

Therefore, there arises a technical problem to be solved in order to stably brake the automatic winding of the screen without depending on the temperature, and an object of the present invention is to solve this problem.

The present invention is proposed to achieve the above object, and the invention according to claim 1 is to provide a winding shaft on either the top or the left or right of the building opening, and the winding shaft has the end of the screen. A braking device for an automatic winding type screen device, wherein a coil spring for urging the winding shaft in a winding direction is installed inside the winding shaft. Together with the housing that is rotatably installed in the winding shaft and has a substantially cylindrical shape, a sleeve that is non-rotatably mounted in the housing, and has a screw thread engraved on the outer circumference, and a sleeve that is screwed onto the sleeve. A movable body rotatable with the housing, a first spring and a second spring loosely fitted to the sleeve and arranged on both sides of the movable body, respectively. The urging force of the first spring and the second spring that is threaded in the housing in the longitudinal direction of the sleeve as the housing rotates and expands and contracts as the moving element is threaded is the winding force. A braking device for an automatic winding screen device for braking rotation of a shaft is provided.

According to this configuration, the housing and the mover rotate together with the winding shaft, and the mover screw-moves on the sleeve so as to expand and contract the first spring and the second spring. An urging force corresponding to the expansion and contraction of the second spring acts on the moving element to prevent the moving element from screwing, and a braking torque resulting from the urging forces of the first spring and the second spring is transmitted via the moving element. Since it acts on the rotating shaft, the screen can be braked.

Further, since the braking device is configured without enclosing oil, it is possible to suppress variations in braking performance due to temperature fluctuations and to brake the screen stably for a long period of time.

According to a second aspect of the invention, in addition to the configuration of the first aspect of the invention, an adjuster that is screwed into an arbitrary position of the sleeve is provided, and the adjuster and the mover are moved according to a mounting position of the adjuster. (EN) Provided is a braking device for an automatic wind-up screen device, which is configured so that an initial expansion/contraction amount of the first spring or the second spring interposed between and can be arbitrarily adjusted.

According to this configuration, since the initial expansion/contraction amount of the first spring or the second spring interposed between the adjuster and the moving element can be adjusted, the braking torque can be arbitrarily increased or decreased.

According to a third aspect of the invention, in addition to the configuration of the first or second aspect of the invention, the urging force of the second spring that brakes the rotation of the winding shaft during the closing operation of the screen is There is provided a braking device for an automatic winding screen device, which is set to be larger than the urging force of the first spring that brakes the rotation of the winding shaft when the screen is opened.

According to this configuration, the braking torques of the first spring and the second spring act more strongly when the screen is closed than when the screen is opened, so that the screen can be smoothly opened. , It is possible to reduce the impact when the screen is automatically wound.

According to a fourth aspect of the invention, in addition to the configuration of the invention according to any one of the first to third aspects, the housing and the mover are engaged with each other in a concavo-convex manner, and the mover is shared with the housing. Provided is a braking device for an automatic winding type screen device that is housed in a rotatable manner.

According to this structure, the housing and the mover are firmly engaged with each other, so that the urging forces of the first spring and the second spring reliably act on the mover that rotates together with the housing, thereby stabilizing the screen. Can be braked.

According to a fifth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, at least one of the first spring and the second spring is loosely fitted to the sleeve. There is provided a braking device for an automatic winding type screen device which is engaged with the housing in a concavo-convex manner and is sandwiched by a slide plate which can rotate together with the housing.

According to this structure, since at least one of the first spring and the second spring is sandwiched by the slide plate, the first spring and the second spring expand and contract stably, so that the screen is stabilized. Can be braked.

According to a sixth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the housing is a braking device for an automatic winding screen device in which an end of the coil spring is fixed. Provide a device.

With this configuration, by directly connecting the coil spring and the housing, it is not necessary to prepare a separate member for connecting the coil spring and the winding shaft, and the number of parts can be reduced.

According to the present invention, the housing and the mover rotate together with the take-up shaft, and the mover is screwed on the sleeve so as to expand and contract the first spring and the second spring. An urging force corresponding to the expansion and contraction of the second spring acts on the moving element to prevent the moving element from screwing, and a braking torque resulting from the urging forces of the first spring and the second spring is transmitted via the moving element. Since it acts on the rotating shaft, the screen can be braked. Moreover, since the braking device is configured to be oil-free, it is possible to suppress variations in braking performance due to temperature fluctuations and to brake the screen stably for a long period of time.

It is a figure which shows the automatic winding type screen which applied the braking device which concerns on one Example of this invention, (a) is a partially notched front view, (b) is a cross-sectional view. It is a figure which shows a braking device, (a) is a front view, (b) is a sectional view on the AA line. It is sectional drawing which shows the braking device of FIG. 2, (a) is BB sectional drawing, (b) is CC sectional drawing of FIG.2(b), (c) is D-. It is a D line sectional view. It is a figure which shows a housing, (a) is a front view, (b) is a right side surface, (c) is a EE line sectional view, (d) is a FF line sectional view. .. It is a figure showing a sleeve, (a) is a left side view, (b) is a front view, (c) is a right side view, and (d) is a GG line sectional view. It is a figure which shows a mover, (a) is a top view, (b) is a HH sectional view. It is a figure which shows an adjuster, (a) is a top view, (b) is an II sectional view taken on the line. It is a figure showing a slide board, (a) is a top view and (b) is a JJ line sectional view. It is a figure which shows a cap, (a) is a top view, (b) is a right view, (c) is a bottom view, (d) is a front view, (e) is K-. It is a K line sectional view. The graph which shows the magnitude relationship of the torque of a coil spring and a braking device.

According to the present invention, in order to stably brake the automatic winding of the screen without depending on the temperature, a winding shaft is provided on either the top or the left or right of the building opening, and the end of the screen is attached to the winding shaft. In a braking device of an automatic winding type screen device, which is attached to the winding shaft freely and has a coil spring for urging the winding shaft in the winding direction installed inside the winding shaft so that it can rotate together with the winding shaft. A housing that is built into the shaft and is formed in a substantially cylindrical shape, a sleeve that is non-rotatably mounted in the housing, and has a screw thread engraved on the outer periphery, and a screw that is screwed into the sleeve and that is rotatable together with the housing. And a first spring and a second spring which are loosely fitted to the sleeve and arranged on both sides of the moving element, respectively. The moving element moves in the housing in the longitudinal direction of the sleeve as the housing rotates. The urging force of the first spring and the second spring, which are screwed forward and expand and contract with the screwing of the moving element, is realized by braking the rotation of the winding shaft.

Hereinafter, an automatic winding type screen device 1 to which a braking device 10 according to an embodiment of the present invention is applied will be described with reference to the drawings. In the following examples, when referring to the number of components, numerical values, amounts, ranges, etc., unless otherwise specified or in principle limited to a particular number, the specific number The number is not limited, and may be a specific number or more or less.

Also, when referring to the shapes and positional relationships of constituent elements, etc., unless otherwise specified, or in principle, it is considered that they should be substantially similar or similar to the shape, etc. Including.

In the drawings, characteristic portions may be exaggerated by enlarging the characteristic portions in order to make the characteristics easy to understand, and the dimensional ratios of the constituent elements are not always the same as the actual ones.

FIG. 1 is a view showing an automatic winding type screen 1, in which (a) is a partially cutaway front view and (b) is a transverse sectional view.

The automatic wind-up screen device 1 is installed in an opening of a building such as a doorway of a house or a window for light shielding, heat insulation, insect repellent, dust proof, and the like. In the following, the horizontal pull-up type automatic winding screen device 1 in which the screen opens and closes in the horizontal direction will be described as an example, but a vertical pull-out type screen device in which the screen opens and closes in the vertical direction may be used.

The automatic winding type screen device 1 includes a pair of left and right vertical frames 2a and 2b and a pair of upper and lower horizontal frames 3a and 3b. The building frames 2a and 2b and the horizontal frames 3a and 3b are connected to each other. The upper and lower ends of the screen 4 such as a screen door are guided by the horizontal frames 3a and 3b.

The vertical frame 2a supports a rotatable winding shaft 5 around which the screen 4 is wound. The winding shaft 5 has a fixed shaft 7 whose upper end is fixed to a bracket 6a provided on the upper part. The winding shaft 5 is supported by support members 8a and 8b rotatably attached to the fixed shaft 7.

The coil spring 9 built in the winding shaft 5 has its upper end fixed to the fixed shaft 7 and its lower end fixed to the support member 8b. That is, the winding shaft 5 is connected to the fixed shaft 7 via the coil spring 9. The reference numeral 4a in FIG. 1A is a lock that prevents the screen 4 from being closed carelessly.

The braking device 10 is built in the lower end of the winding shaft 5, is freely rotatable on the fixed shaft 10a, and is non-rotatably attached to the winding shaft 5. The fixed shaft 10a is fixed to the bracket 6b.

Next, the basic structure of the braking device 10 will be described with reference to the drawings. 2A and 2B are views showing the braking device 10, in which FIG. 2A is a front view and FIG. 2B is a sectional view taken along the line AA. 3A and 3B are cross-sectional views showing the braking device 10, where FIG. 3A is a cross-sectional view taken along the line BB, FIG. 3B is a cross-sectional view taken along the line C-C of FIG. 2B, and FIG. It is a DD sectional view.

The braking device 10 includes a housing 20 formed in a substantially cylindrical shape. A recess 21 formed along the longitudinal direction L is provided on the outer periphery of the housing 20. The recess 21 can be engaged with a protrusion (not shown) formed on the inner circumference of the winding shaft 5. As a result, the housing 20 is mounted so as not to rotate with respect to the winding shaft 5.

A sleeve 30 having a smaller diameter than the housing 20 and having a substantially cylindrical shape is inserted into the housing 20. A screw portion 32 is engraved on the outer periphery of the shaft portion 31 of the sleeve 30.

The mover 40 and the adjuster 50 are screwed into the sleeve 30. The mover 40 is arranged near the center of the shaft portion 31, and the adjuster 50 is arranged on the tip side of the shaft portion 31. The adjuster 50 is fixed to the sleeve 30 via the bolt b.

A first spring 60 is provided between the moving element 40 and the flange portion 33 provided on the base end side of the sleeve 30. A second spring 70 is provided between the mover 40 and the adjuster 50.

Slide plates 80 are provided at both ends of the first spring 60 and both ends of the second spring 70. That is, the slide plate 80 includes the flange portion 33 and the first spring 60, the mover 40 and the first spring 60, the mover 40 and the second spring 70, and the adjuster 50 and the first spring 60. The two springs 70 are respectively interposed.

A cap 90 is provided at the tip of the sleeve 30. The cap 90 has a recess 91 formed along the longitudinal direction L. The concave portion 91 is engaged with the first convex portion 22 formed on the inner circumference of the housing 20. As a result, the cap 90 is non-rotatably attached to the housing 20.

Next, the components of the braking device 10 will be described in detail. FIG. 4 is a view showing the housing 20, (a) is a front view, (b) is a right side surface, (c) is a sectional view taken along line EE, and (d) is FF. It is a line sectional view. 5: is a figure which shows the sleeve 30, (a) is a left side view, (b) is a front view, (c) is a right side view, (d) is a GG line cross section. It is a figure. 6A and 6B are diagrams showing the mover 40, FIG. 6A is a plan view, and FIG. 6B is a sectional view taken along line HH. 7: is a figure which shows the adjuster 50, (a) is a top view, (b) is an II sectional view taken on the line. 8A and 8B are views showing the slide plate 80, FIG. 8A is a plan view, and FIG. 8B is a sectional view taken along the line JJ. 9A and 9B are views showing the cap 90, FIG. 9A is a plan view, FIG. 9B is a right side view, FIG. 9C is a bottom view, and FIG. 9D is a front view. e) is a KK line sectional view.

As shown in FIG. 4, the housing 20 is formed in a substantially cylindrical shape with both ends open. The first convex portions 22 of the housing 20 are formed so as to bulge from the main body portion 23 toward the inner peripheral side, and are arranged inside the main body portion 23 so as to be vertically paired and face each other. Further, the second convex portions 24, which are formed so as to project from the main body portion 23 toward the inner peripheral side, are arranged inside the main body portion 23 in a left-right pair and facing each other. The first convex portion 22 and the second convex portion 24 are arranged so as to be out of phase with each other by 90 degrees when viewed from the side surface. The lower end of the coil spring 9 may be fixed to the outer periphery of the housing 20 instead of being connected to the support member 8b.

As shown in FIG. 5, a rectangular insertion hole 34 is formed at the tip of the sleeve 30. The fixed shaft 10a having a rectangular cross section can be inserted into the insertion hole 34, and when the fixed shaft 10a is inserted into the insertion hole 34, the sleeve 30 is fixed to the bracket 6b so as not to rotate. The pitch of the threaded portion 32 of the sleeve 30 corresponds to the amount of advance (slide amount) when the mover 40 makes one rotation relative to the sleeve 30.

As shown in FIG. 6, the mover 40 is formed in a substantially elliptical shape in a plan view so as not to contact the convex portion 22 when assembled in the housing 20. A screw hole 41 is provided in the center of the mover 40 and can be screwed into the screw portion 32.

The mover 40 has two slits 42 formed by cutting out a part of the outer circumference. The mover 40 is non-rotatably connected to the housing 20 by the slit 42 engaging with the second convex portion 24. The mounting position of the mover 40 on the sleeve 30 can be appropriately changed according to the desired initial expansion/contraction amount of the first spring 60.

As shown in FIG. 7, the adjuster 50 is formed in a regular hexagonal shape in a plan view. A screw hole 51 is provided in the center of the adjuster 50 and can be screwed into the screw portion 32. The mounting position of the adjuster 50 on the sleeve 30 can be appropriately changed according to the desired initial expansion/contraction amount of the second spring 70.

As shown in FIG. 8, the slide plate 80 is formed in a substantially elliptical shape in a plan view so as not to come into contact with the convex portion 22 when assembled to the housing 20. An insertion hole 81 is formed in the center of the slide plate 80 so that the shaft plate 31 can be loosely fitted therein.

On the slide plate 80, two slits 82 are formed by cutting out a part of the outer circumference. The slide plate 80 is non-rotatably connected to the housing 20 by the engagement of the slit 82 with the second convex portion 24.

Further, the front surface 83 or the back surface 84 of the slide plate 80 is brought into contact with the flange portion 33, the mover 40, the adjuster 50, the first spring 60 or the second spring 70. As a result, the first spring 60 or the second spring 70 sandwiched by the slide plate 80 is prevented from idling with respect to the moving element 40.

As shown in FIG. 9, the cap 90 is formed on a substantially disc in a plan view. An insertion hole 92 is formed in the center of the cap 90 so that the fixed shaft 10b can be inserted therethrough. The accommodation recess 93 is communicated with the insertion hole 92, and the tip of the sleeve 30 is fitted into the accommodation recess 93.

Next, the operation of the braking device will be described with reference to the drawings. FIG. 10 is a graph showing the magnitude relationship between the torques of the coil spring 9 and the braking device 10.

When the screen 4 is manually closed, the winding shaft 5 and the housing 20 rotate counterclockwise in FIG. 1B, and the coil spring 9 is twisted by the amount of rotation of the winding shaft 5, while the mover moves. 40 is screwed on the sleeve 30 in a direction to contract the first spring 60, and the urging force of the first spring 60 and the second spring 70 is generated. That is, a biasing force in the compression direction due to the contraction of the first spring 60 and a biasing force in the tension direction due to the extension of the second spring 70 act on the mover 40. Further, the winding shaft 5 rotates so as to resist the biasing force of the coil spring 9.

When the lock 4a of the screen 4 is released, the winding shaft 5 and the housing 20 rotate in the opening direction of the screen 4 (clockwise in FIG. 1B), and the mover 40 contracts the second spring 70. The sleeve 30 in the direction. A biasing force in the tension direction due to the extension of the first spring 60 and a biasing force in the compression direction due to the contraction of the second spring 70 act on the mover 40. Further, the twist of the coil spring 9 is returned by the amount of rotation of the winding shaft 5.

A torque according to the biasing force of the first spring 60 and the second spring 70 (hereinafter referred to as "braking torque") and a torque according to the twist of the coil spring 9 (hereinafter referred to as "winding torque"). The relationship will be described. “SAMPLE” in FIG. 10 indicates braking torque, and “ACTUAL UNIT” indicates winding torque. The horizontal axis indicates the number of rotations of the winding shaft 5, "0" indicates a state in which the screen 4 is entirely wound, and "8" indicates a state in which the screen 4 is entirely projected.

As shown in FIG. 10, the winding torque increases in proportion to the rotation speed of the winding shaft 5.

On the other hand, the braking torque is minimum when the winding shaft 5 rotates five times, and is maximum when the screen 4 is wound (zero rotation speed of the winding shaft 5). The rotational speeds 0 to 2 in FIG. 10 are ranges in which the biasing force of the second spring 70 is strong, and the rotational speeds 2 to 8 in FIG. 10 are strong in the biasing force of the first spring 60. It is a range. This is because the spring constant (spring characteristic) of the second spring 70 is set stronger than the spring constant (spring characteristic) of the first spring 60. For example, the spring constant of the first spring 60 is set to 5.38 N/m, and the spring constant of the second spring 70 is set to 8.88 N/m, for example. The curve indicating the braking torque can be arbitrarily changed by changing the shapes and diameters of the first spring 60 and the second spring 70.

Due to such a relationship between the winding torque and the braking torque, the braking torque gradually decreases when the screen 4 is gradually closed from the fully opened state, so that the closing operation of the screen 4 can be performed smoothly without feeling stress. Be seen. On the other hand, when the screen 4 is automatically wound up from the fully closed state, the winding operation of the screen 4 is quickly performed in the opening stage (for example, the number of rotations of the winding shaft 5 is 3 to 8), and the end stage (for example, When the number of rotations of the winding shaft 5 is 0 to 2), the braking torque exceeds the winding torque, and the winding operation of the screen 4 is slowly performed.

In this way, in the braking device 10 of the automatic winding screen device 1 according to the present invention, the housing 20 and the moving element 40 rotate together with the winding shaft 5, and the moving element 40 moves the first spring 60 and the second moving element 40. By screwing on the sleeve 30 so as to expand and contract the spring 70, an urging force corresponding to the expansion and contraction of the first spring 60 and the second spring 70 acts on the mover 40 to move the mover 40 in a screwed manner. The screen 4 can be braked because it is hindered and the braking torque acts on the rotating shaft 5 via the moving element 40. Further, since the braking device 10 is configured to be oil-free, it is possible to suppress variations in braking performance due to temperature fluctuations and to brake the screen stably for a long period of time.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.

The present invention can be applied not only to the wind-up type screen door but also to a roll curtain or a shutter device.

1... Automatic winding type screen device 2a, 2b... Vertical frame 3a, 3b... Horizontal frame 4... Screen 5... Winding shaft 6a, 6b... Bracket 7... Fixed Shafts 8a, 8b... Support member 9... Coil spring 10... Braking device 10a... Fixed shaft 20... Housing 21... Recess 22 (of housing)... 1st convex portion 23... Body part 24... 2nd convex part 30... Sleeve 31... Shaft part 32... Screw part 33... Flange part 34... Communication hole 40... Mover 41 ... (moving element) screw hole 42 ... (moving element) slit 50 ... adjuster 51 ... (adjuster) screw hole 60 ... first spring 70 ... second Spring 80 ... Sliding plate 81 ... Communication hole 82 (of sliding plate) ... Slit (of sliding plate) 83 ... Front surface 84 ... Back surface 90 ... Cap 91 ... (Cap Recessed portion 92... (cap) communication hole 93... accommodation recessed portion

Claims (6)

A winding shaft is provided on either the top or the left or right of the building opening, and the end of the screen is attached to the winding shaft in a windable manner, and a coil spring for urging the winding shaft in the winding direction is provided. In a braking device for an automatic winding type screen device which is built in the winding shaft,
A housing that is rotatably installed in the winding shaft together with the winding shaft and has a substantially cylindrical shape;
A sleeve that is non-rotatably mounted in the housing and has a thread engraved on the outer periphery;
A mover screwed to the sleeve and rotatable with the housing;
A first spring and a second spring that are loosely fitted to the sleeve and are respectively arranged on both sides of the mover;
Is provided
The mover is screwed in the housing in the longitudinal direction of the sleeve as the housing rotates.
A braking device for an automatic winding screen device, wherein the biasing force of the first spring and the second spring that expands and contracts as the moving element is screwed brakes the rotation of the winding shaft. .. Provide an adjuster screwed to any position of the sleeve,
According to the mounting position of the adjuster, the initial expansion or contraction amount of the first spring or the second spring interposed between the adjuster and the mover can be arbitrarily adjusted. The braking device for the automatic winding screen device according to claim 1. The urging force of the second spring that brakes the rotation of the winding shaft during the closing operation of the screen is the same as the urging force of the first spring that brakes the rotation of the winding shaft during the opening operation of the screen. The braking device for an automatic winding type screen device according to claim 1 or 2, wherein the braking device is set to be larger than the urging force. The automatic winding according to any one of claims 1 to 3, wherein the housing and the mover are engaged with each other in a concavo-convex manner so that the mover is housed so as to be rotatable with the housing. Type screen braking device. At least one of the first spring and the second spring is loosely fitted to the sleeve and is engaged with the housing in a concavo-convex manner so as to be sandwiched by a slide plate which can rotate together with the housing. A braking device for an automatic winding screen device according to any one of claims 1 to 4. The braking device for the automatic winding screen device according to claim 1, wherein the housing has an end portion of the coil spring fixed thereto.